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in subjects: "Temperature Gradients"  
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STUDY ON AIR INGRESS MITIGATION METHODS IN THE VERY HIGH TEMPERATURE GAS COOLED REACTOR (VHTR)

Description: An air-ingress accident followed by a pipe break is considered as a critical event for a very high temperature gas-cooled reactor (VHTR). Following helium depressurization, it is anticipated that unless countermeasures are taken, air will enter the core through the break leading to oxidation of the in-core graphite structure. Thus, without mitigation features, this accident might lead to severe exothermic chemical reactions of graphite and oxygen. Under extreme circumstances, a loss of core str… more
Date: March 1, 2011
Creator: Oh, Chang H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LiWall Fusion - The New Concept of Magnetic Fusion

Description: Utilization of the outstanding abilities of a liquid lithium layer in pumping hydrogen isotopes leads to a new approach to magnetic fusion, called the LiWall Fusion. It relies on innovative plasma regimes with low edge density and high temperature. The approach combines fueling the plasma by neutral injection beams with the best possible elimination of outside neutral gas sources, which cools down the plasma edge. Prevention of cooling the plasma edge suppresses the dominant, temperature gradie… more
Date: January 12, 2011
Creator: Zakharov, L. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

COMPUTER MODELING OF HIGH-LEVEL WASTE GLASS TEMPERATURES WITHIN DWPF CANISTERS DURING POURING AND COOL DOWN

Description: This report describes the results of a computer simulation study to predict the temperature of the glass at any location inside a DWPF canister during pouring and subsequent cooling. These simulations are an integral part of a larger research focus aimed at developing methods to predict, evaluate, and ultimately suppress nepheline formation in HLW glasses. That larger research focus is centered on holistically understanding nepheline formation in HLW glass by exploring the fundamental thermal a… more
Date: October 9, 2011
Creator: Amoroso, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

OTEC Advanced Composite Cold Water Pipe: Final Technical Report

Description: Ocean Thermal Energy Conversion can exploit natural temperature gradients in the oceans to generate usable forms of energy (for example, cost-competitive baseload electricity in tropical regions such as Hawaii) free from fossil fuel consumption and global warming emissions.The No.1 acknowledged challenge of constructing an OTEC plant is the Cold Water Pipe (CWP), which draws cold water from 1000m depths up to the surface, to serve as the coolant for the OTEC Rankine cycle. For a commercial-scal… more
Date: September 12, 2011
Creator: Miller, Dr. Alan & Ascari, Matthew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Superheater Corrosion In Biomass Boilers: Today's Science and Technology

Description: This report broadens a previous review of published literature on corrosion of recovery boiler superheater tube materials to consider the performance of candidate materials at temperatures near the deposit melting temperature in advanced boilers firing coal, wood-based fuels, and waste materials as well as in gas turbine environments. Discussions of corrosion mechanisms focus on the reactions in fly ash deposits and combustion gases that can give corrosive materials access to the surface of a s… more
Date: December 1, 2011
Creator: Sharp, William (Sandy)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Study of Advanced Materials for Gas Turbine Coatings at Elevated Temperatures Using Selected Microstructures and Characteristic Environments for Syngas Combustion

Description: Thermal barrier coatings (TBCs) that can be suitable for use in industrial gas turbine engines have been processed and compared with electron beam physical vapor deposition (EBPVD) microstructures for applications in advanced gas turbines that use coal-derived synthesis gas. Thermo-physical properties have been evaluated of the processed air plasma sprayed TBCs with standard APS-STD and vertically cracked APS-VC coatings samples up to 1300 C. Porosity of these selected coatings with related mic… more
Date: February 10, 2011
Creator: Diwan, Ravinder; Mensah, Patrick; Li, Guoqiang; Uppu, Nalini; Akwaboa, Strphen; Silva, Monica et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational fluid dynamics analyses of lateral heat conduction, coolant azimuthal mixing and heat transfer predictions in a BR2 fuel assembly geometry.

Description: To support the analyses related to the conversion of the BR2 core from highly-enriched (HEU) to low-enriched (LEU) fuel, the thermal-hydraulics codes PLTEMP and RELAP-3D are used to evaluate the safety margins during steady-state operation (PLTEMP), as well as after a loss-of-flow, loss-of-pressure, or a loss of coolant event (RELAP). In the 1-D PLTEMP and RELAP simulations, conduction in the azimuthal and axial directions is not accounted. The very good thermal conductivity of the cladding and… more
Date: May 23, 2011
Creator: Tzanos, C. P. & Dionne, B. (Nuclear Engineering Division)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy Saving Melting and Revert Reduction (E-SMARRT): Precision Casting of Steel

Description: This project addresses improvements in metal casting processes by reducing scrap and reducing the cost of production, due to scrap reduction from investment casting and yield improvement offered by lost foam casting as compared to no-bake or green sand molding. The objectives for the investment casting portion of the subtask are to improve knowledge of fracture toughness of mold shells and the sources of strength limiting flaws and to understand the effects of wax reclamation procedures on wax … more
Date: September 30, 2011
Creator: Richards, Dr. Von L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Offshore Renewable Energy R&D (Fact Sheet)

Description: This fact sheet describes the offshore renewable energy R&D efforts at NREL's NWTC. As the United States increases its efforts to tap the domestic energy sources needed to diversify its energy portfolio and secure its energy supply, more attention is being focused on the rich renewable resources located offshore. Offshore renewable energy sources include offshore wind, waves, tidal currents, ocean and river currents, and ocean thermal gradients. According to a report published by the Nation… more
Date: October 1, 2011
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Control System For Cryogenic THD Layering At The National Ignition Facility

Description: The National Ignition Facility (NIF) is the world largest and most energetic laser system for Inertial Confinement Fusion (ICF). In 2010, NIF began ignition experiments using cryogenically cooled targets containing layers of the tritium-hydrogen-deuterium (THD) fuel. The 75 {micro}m thick layer is formed inside of the 2 mm target capsule at temperatures of approximately 18 K. The ICF target designs require sub-micron smoothness of the THD ice layers. Formation of such layers is still an active … more
Date: March 18, 2011
Creator: Fedorov, M; Blubaugh, J; Edwards, O; Mauvais, M; Sanchez, R & Wilson, B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

OECD MCCI Small-Scale Water Ingression and Crust Strength Tests (Sswics) Design Report, Rev. 2 October 31, 2002.

Description: The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core/concrete interaction (MCCI) when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. … more
Date: May 23, 2011
Creator: Farmer, M.; Lomperski, S.; Kilsdonk, D.; Aeschlimann, B. & Pfeiffer, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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